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Business and Summary of Significant Accounting Policies - Construction in Progress (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Operating Leased Assets [Line Items]    
Initial term of contract 5 years  
Construction in progress $ 23,546 $ 2,252
Financing obligation 23,096 1,802
Deposit $ 500 $ 500
Building    
Operating Leased Assets [Line Items]    
Initial term of contract 12 years  
Obligations for operating lease $ 68,200